Mike,
I have uploaded the comparison you requested for ROS (16 baud this time
for better comparison overall) compared to CHIP64, both idling:
http://home.comcast.net/~hteller/ROS16vsChip64.jpg
It is hard to see what happens when you send data in CHIP64 as the
signal looks a lot like noise, but you can definitely ascertain a fixed
pattern in the noise at idle. I can't spot any repetitive pattern in
ROS, even at 16 baud. Perhaps you can. When you send data, it is hard to
see any change in CHIP64. From the image, it looks like the spreading in
CHIP64 is by a fixed pattern, and perhaps the data modulates the fixed
carriers. Anyway, I have not seen the technical description, so I don't
know. I'll leave it to you to more accurately interpret the images. I
had to use MultiPSK instead of DigiPan this time to get better detail
regarding amplitude with corresponding colors.
73 - Skip KH6TY
silversmj wrote:
Hey Skip KH6TY,
Could you show us a pic of Chip64 (your choice to compare it to ROS)?
Have a look at the links on my message 34845:
http://groups.yahoo.com/group/digitalradio/message/34845
<http://groups.yahoo.com/group/digitalradio/message/34845>
The author of Chip64 uses DSSS but in a much narrow BW than ROS. How
it works is very nicely disclosed.
Since your currently closer (according to QRZ) to the ARRL VA Section
NTS than I, perhaps you could listen for the Virginia Digital Net
(VDN) 1915 Eastern M-F 3578.5 kHz who advertises/promotes using Chip64.
I appreciate all that you and the author of ROS have done for amateur
radio.
Kind 73 de Mike KB6WFC
